How to interpret or read this?

[WIN]

can anyone help with this type of graph... trying to get the relationship between the y n x axis...maybe the gradient ..but i don't know how to read this graph due to the scaling...guide pls?

 

[DrClaude]

Could you please translate the labels on the axes?

As for the scaling, it is a log-log plot. On the y axis, the lines between 1 and 10 are 2, 3, 4, etc., the lines between 10 and 100 and 20, 30, etc., and so on.

 

[WIN]

its rate of flow at x-axis and pressure loss (head loss)at y axis

 

[SteamKing]

can anyone help with this type of graph... trying to get the relationship between the y n x axis...maybe the gradient ..but i don't know how to read this graph due to the scaling...guide pls?

You enter this chart with a given value of Q in liters / sec. and then follow a vertical line upward until it intersects one of the DN lines. Then you draw a horizontal line from this intersection to the left axis and read the value of Δh.

 

[DrClaude]

I'm not sure what the different DN correspond to, but following a given DN line, you get the pressure as a function of the rate of flow, in a logarithmic scale as I explained previously.

 

[SteamKing]

I'm not sure what the different DN correspond to, but following a given DN line, you get the pressure as a function of the rate of flow, in a logarithmic scale as I explained previously.

I suspect the DN lines represent different sizes of something: a pipe, a fitting, or some such.

 

[WIN]

yup..thx a lot.. i just looked up on the log-log plot in wiki... was lost due to the plotting style..
DN XX is the size of valve according to German standards like ISO standard...